Thermo Products CMA1-50N, CMA2-75N service manual E. Fuel Piping

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E. FUEL PIPING

All installations and services must be performed by qualified service personnel.

E. FUEL PIPING

Sizing and installation of fuel lines must be in accordance with Federal, State & Local regulations. Including the National Fuel Gas Code NFPA 54/ANSI-Z233.1 (Latest Edition).

NOTE: These furnaces are designed to be gas piped through the left side or the bottom. For service purposes, it is recommended that the gas union be located inside the furnace when possible.

Manual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background : Because of the potential of odorant fade, a gas leak may not be detected by smell. If this furnace is installed below grade, contact your gas supplier for a gas detector.

A qualified installer or service person must perform all gas piping and testing. Piping from the natural gas meter to the furnace shall be in accordance with requirements of the local gas utility. Piping from the LP tank to the furnace must follow the recommendations of the gas supplier.

A readily accessible manual shut off valve (certified for the applicable gas) with a non-displaceable rotor member shall be installed within six feet of the gas equipment it serves.

A union or flanged connection shall be provided directly up stream of the burner to allow burner removal. Unions must be of a ground joint type or flange-jointed type using a gasket resistant to the applicable gas. Pipe dope or sealant certified to be resistant to the action of the applicable gases should be used on all threaded joints.

A drip leg must be used on both LP and Natural gas installations prior to the furnace in order to trap oil, condensate and other impurities which might otherwise lodge in the gas valve or plug the burner orifice.

A drip leg shall be provided at the outlet of the gas meter when there is excessive condensation between the gas meter and the furnace. Failure to install a drip leg may void the limited warranty on the furnace.

Manual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background : All gas pipe connections must be leak tested using methods approved by State, Local and National Fuel Gas Code NFPA 54/ANSI-Z233.1 (Latest Edition). Any leaks must be repaired immediately after turning off the gas supply. A final test for gas leakage must be made after purging the gas line.

Manual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background : DO NOT wet electronic components during the leak test. Wetting electronic components may damage circuitry and cause a hazardous situation. Dry moisture from all leads and terminals if wetting occurs. Wait at least 24 hours for the circuit to fully dry before energizing the system.

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Contents FOR YOUR SAFETY INSTALLATION AND SERVICE MANUALGAS FIRED HIGH EFFICIENCY FURNACE DOWN FLOW & DIRECT VENT SEALED COMBUSTIONSECTION TABLE OF CONTENTSI. SAFETY INFORMATION Page Page The vent and air intake elbows must be kept away from bushes, shrubs or any vegetation that may restrict the flow of flue products. It must also be kept clear of any leaves, weeds or other combustible materials. Keep the vent hood clear of snow. Avoid locating the terminals in areas where standing water or condensate drippage may be a problem 1.A windows be opened DIMENSIONS II. FURNACE SPECIFICATIONS - CMA SERIESMODEL GAS SUPPLY PRESSUREINSTALLATION PARTS PACKAGE NON-COMBUSTIBLEMATERIAL COMBUSTIBLE MATERIAL.” COMBUSTIBLE MATERIALTable IV. GENERAL INSTALLATION A.FURNACE LOCATIONMODELS CMA Figure 1B Combustible Floor Base Model: 70-BASE Figure 1ACoil Cabinet Cottage Base Model: 01COT-BASE Figure 1C Figure Figure B. BASE INSTALLATION1. Combustible Floor Base Model: 70 BASE Figure C. ALCOVE INSTALLATION2. Cottage Base Model: 01COT BASE Figure D. CLOSET INSTALLATIONE. FUEL PIPING F.GENERAL VENTING REQUIREMENTS Table MAXIMUM VENT LENGTHFigure 6. CMA*-75SHOWN 1. Vent And Combustion Air Pipes H. Direct Venting Through a Sidewall2. Exhaust Vent Termination Elbow Sidewall Venting Page 4. Vent Terminal Location Guidelines Terminations Figure Figure 5.Secure plate to roofFigure K.CONDENSATE DRAIN LINE AND TRAP ASSEMBLY 2.Connection Of Power Supply Wires Figure L.ELECTRICAL WIRING3.Connection Of Room Thermostat Wires 1. Electrical Branch Supply CircuitElectrical Wire Diameter AWG 24 22 20 18 4. BLOWER MOTOR SPEED WIRING Figure Speed Tap \ CMA1-50Static PressureSpeed Tap \ CMA2-75Static Pressure5. FIELD WIRING AND REPLACING WIRING V.STARTING THE UNIT A. SEQUENCE OF OPERATIONS MAIN BURNER OPERATION CALL FOR HEAT SATISFIED OPERATING INSTRUCTIONS B.INITIAL START UPC.ADJUSTMENT OF BTU INPUT RATE D.BURNER ADJUSTMENT GAS PRESSURE CHART FOR CMA* MODEL FURNACESFigure E.SETTING TEMPERATURE RISEF.FURNACE CHECKOUT PROCEDURE VII. DEALER MAINTENANCE VI. INSTALLERS INSTRUCTIONS TO USER4. INDUCER BLOWER ASSEMBLY 2.CONDENSATE LINE/TRAP ASSEMBLYA.ELECTRICAL B.GENERAL INSPECTION5. GASKETS/SEALING MATERIALS 1.CLEANING THE COIL AIR SIDEC.HEAT EXCHANGER D.HOUSE AIR BLOWERFILTER REPLACEMENT FILTER MAINTENANCE PROCEDUREVIII. TROUBLESHOOTING DIAGNOSTIC FEATURESThe LED will also flash once at power-up TROUBLESHOOTING GUIDE AT THE INTEGRATED CONTROL? Yes AFTER GAS VALVE OPENS, DO THE BURNERS IGNITE? DOES SYSTEM RUN UNTIL THERMOSTAT IS SATISFIED? IF LED LIGHT FLASHES APPENDIX – A REPLACEMENT PARTS Page APPENDIX – B WIRING DIAGRAM